When selecting a texture in Inspectors -> Media -> Textures that doesn't
really exist (.mtr defines it, but referenced image files are missing),
the game/editor used to crash.
The problem was that somehow people thought the best way to communicate
that a file wasn't found was by setting the timestamp to 0xFFFFFFFF
and then checking for that - sometimes (incorrectly) by comparing it to -1.
That worked for 32bit ID_TIME_T (typedefed to time_t), but not with 64bit
time_t, which now seems to be the default for Win32 in VS.
So I replaced a few -1 and 0xFF... with FILE_NOT_FOUND_TIMESTAMP and now it
works.
FILE_NOT_FOUND_TIMESTAMP is still defined as 0xFFFFFFFF, maybe I should
change that, unsure if that'd break anything though..
When changing it one should keep in mind that time_t might still be 32bit
on some platforms (Linux x86?) so that should still work.. (-1 could work)
Don't include the lazy precompiled.h everywhere, only what's
required for the compilation unit.
platform.h needs to be included instead to provide all essential
defines and types.
All includes use the relative path to the neo or the game
specific root.
Move all idlib related includes from idlib/Lib.h to precompiled.h.
precompiled.h still exists for the MFC stuff in tools/.
Add some missing header guards.
